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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) Copyright 2017 Rockchip Electronics Co., Ltd
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <malloc.h>
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#include <reset-uclass.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <asm/arch-rockchip/hardware.h>
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#include <dm/lists.h>
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/*
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* Each reg has 16 bits reset signal for devices
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* Note: Not including rk2818 and older SoCs
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*/
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#define ROCKCHIP_RESET_NUM_IN_REG 16
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struct rockchip_reset_priv {
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void __iomem *base;
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/* Rockchip reset reg locate at cru controller */
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u32 reset_reg_offset;
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/* Rockchip reset reg number */
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u32 reset_reg_num;
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};
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static int rockchip_reset_request(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
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if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
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return -EINVAL;
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return 0;
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}
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static int rockchip_reset_free(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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return 0;
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}
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static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
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int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id,
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priv->base + (bank * 4));
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rk_setreg(priv->base + (bank * 4), BIT(offset));
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return 0;
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}
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static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
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int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id,
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priv->base + (bank * 4));
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rk_clrreg(priv->base + (bank * 4), BIT(offset));
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return 0;
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}
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struct reset_ops rockchip_reset_ops = {
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.request = rockchip_reset_request,
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.rfree = rockchip_reset_free,
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.rst_assert = rockchip_reset_assert,
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.rst_deassert = rockchip_reset_deassert,
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};
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static int rockchip_reset_probe(struct udevice *dev)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(dev);
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fdt_addr_t addr;
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fdt_size_t size;
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addr = dev_read_addr_size(dev, "reg", &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
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return -EINVAL;
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addr += priv->reset_reg_offset;
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priv->base = ioremap(addr, size);
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debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
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priv->base, priv->reset_reg_offset, priv->reset_reg_num);
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return 0;
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}
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int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
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{
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struct udevice *rst_dev;
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struct rockchip_reset_priv *priv;
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int ret;
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ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
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dev_ofnode(pdev), &rst_dev);
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if (ret) {
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debug("Warning: No rockchip reset driver: ret=%d\n", ret);
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return ret;
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}
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priv = malloc(sizeof(struct rockchip_reset_priv));
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priv->reset_reg_offset = reg_offset;
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priv->reset_reg_num = reg_number;
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rst_dev->priv = priv;
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return 0;
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}
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U_BOOT_DRIVER(rockchip_reset) = {
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.name = "rockchip_reset",
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.id = UCLASS_RESET,
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.probe = rockchip_reset_probe,
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.ops = &rockchip_reset_ops,
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.priv_auto = sizeof(struct rockchip_reset_priv),
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};
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